Keaton 435 #1 Posted July 2 I don't know if I can use this, first time tearing a small engine this far apart and putting it back togher, I have taken a k181 apart, but do you think I can slightly feel it with my nail, it does not seem bad, but some of you on here might know better than me, and what can I clean the piston witn the carbon that is on there? 1 Share this post Link to post Share on other sites
Keaton 435 #2 Posted July 2 and from what I got the crank is 9 &69 thou and the rod is 9 & 39thou, not Shure what that means if anyone can help Share this post Link to post Share on other sites
Pullstart 62,856 #3 Posted July 2 If it’s really a 30 thou (.030”) difference, that will not work. 2 Share this post Link to post Share on other sites
Achto 27,571 #4 Posted July 2 (edited) 2 hours ago, Keaton said: and from what I got the crank is 9 &69 thou and the rod is 9 & 39thou, not Shure what that means if anyone can help The max wear limit of the crank pin is .9350", new size is .9360" - .9355". Measure you crank pin in several spots to check for out of taper & out of round as well. If it does not fall with in factory specs, then it should be turned down and an under sized rod would be required. If this needs to be done, determine what under size you will need -.010", -.020" are standard under sizes. Once you determine the size you will need, order the new rod and take it with you to the machine shop. Have them size the crank to the correct clearance for the new rod. Rod to crank pin clearance is .001" - .0025" If the bore is with in specs then you can use the old piston with new rings. Berryman chem-dip works well for cleaning pistons, carbs, etc. https://www.amazon.com/Berryman-Products-996-Chem-Dip-Carburetor/dp/B00DSMEL2A/ref=asc_df_B00DSMEL2A/?tag=hyprod-20&linkCode=df0&hvadid=693467268860&hvpos=&hvnetw=g&hvrand=15159149524155813824&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9019421&hvtargid=pla-714363490952&psc=1&mcid=c8e04f709e863048bee0f4b873ae42bc&gad_source=1 Here is a Kohler manual with all the specs & instructions that you will need to rebuild your engine. https://resources.kohler.com/power/kohler/enginesUS/pdf/tp_2379.pdf Edited July 2 by Achto 3 1 Share this post Link to post Share on other sites
Keaton 435 #5 Posted July 2 @Achto we need to go down to the mechines shop i am going to take it down there and have him check it and maybe but a .001 on the crank and rod if he can, I will let you know, thanks 1 Share this post Link to post Share on other sites
squonk 41,104 #6 Posted July 2 Very few machine shops have the capability to turn crankshafts that small. Good luck. Share this post Link to post Share on other sites
Keaton 435 #7 Posted July 18 (edited) I think I'm going to get a used crank, is a crank that is .939 still good for use it confuses me @Achto, I think by the time I have it machined and a new rod this would be better edit: and there was another one at .934 also are they out of wear? Edited July 18 by Keaton 1 Share this post Link to post Share on other sites
Achto 27,571 #8 Posted July 18 .9360 to .9355 is considered new, .939 would be larger than new. I would re-measure that. Measure in several spots to check taper and out of round as well. The minimum diameter of a stock crank is .9350. Any thing below that would have to be turned down to use an under sized rod. Page 1.6 in this manual has your wear limits. https://resources.kohler.com/power/kohler/enginesUS/pdf/tp_2379.pdf Share this post Link to post Share on other sites
Keaton 435 #9 Posted July 18 (edited) @Achto, I found this crank on eBay, and the othor one says .934 that is 1 thou below new wear correct? would that be a good one to get? Edited July 18 by Keaton 1 Share this post Link to post Share on other sites
Achto 27,571 #10 Posted July 18 4 minutes ago, Keaton said: .934 that is 1 thou below new wear correct? would that be a good one to get? That is below wear limits. So you would be spending more money to get it turned down to .926 in order to use a .010 under sized rod. Share this post Link to post Share on other sites
Keaton 435 #11 Posted July 18 ok, i think i found a place to turn it, ill have them turn the one i have then. 1 Share this post Link to post Share on other sites
squonk 41,104 #12 Posted July 18 2 hours ago, Keaton said: ok, i think i found a place to turn it, ill have them turn the one i have then. Post the name of the place so we all know please. 1 Share this post Link to post Share on other sites
Keaton 435 #13 Posted July 19 I made a new post about it but it is maco machine shop in central Iowa, look at my posts for more info Share this post Link to post Share on other sites
